With the MWE below, I get the x-axis multiplier along with the x-axis label as shown in the figure.
However, the y-axis label is at the right position. How do I move the x-axis multiplier to an appropriate position that matches the present y-axis multiplier in PGFPlot?
MWE
% used PGFPlots v1.14
\documentclass{article}
\usepackage{filecontents}
\usepackage{pgfplots}
\begin{filecontents*}{pgfplots.dat}
Level Cost Error Fourth
1,7,8.471e-02,3
2,31,3.044e-02,5
3,111,1.022e-02,7
4,351,3.303e-03,9
5,1023,1.038e-03,11
6,2815,3.196e-04,13
7,7423,9.657e-05,15
8,18943,2.873e-05,17
9,47103,8.437e-06,19
\end{filecontents*}
\begin{document}
\begin{figure}
\centering
\begin{tikzpicture}
\begin{axis}[
xlabel = Cost,
ylabel = Error,
]
\addplot table[x index=1, y index=2, col sep=comma] {pgfplots.dat};
\addlegendentry{Case 1}
\addplot table[x index=1, y index=0, col sep=comma] {pgfplots.dat};
\addlegendentry{Case 2}
\addplot table[x index=1, y index=3, col sep=comma] {pgfplots.dat};
\addlegendentry{Case 3}
\addplot table[x index=3, y index=1, col sep=comma] {pgfplots.dat};
\addlegendentry{Case 4}
\addplot table[x index = 0, y index=1, col sep=comma] {pgfplots.dat};
\addlegendentry{Case 5}
\addplot table[x index=3, y index=3, col sep=comma] {pgfplots.dat};
\addlegendentry{Case 6}
\addplot table[x index=3, y index=0, col sep=comma] {pgfplots.dat};
\addlegendentry{Case 7}
\addplot table[x index=2,y index=1, col sep=comma] {pgfplots.dat};
\addlegendentry{Case 8}
\addplot table[x index = 0, y index=3, col sep=comma] {pgfplots.dat};
\addlegendentry{Case 9}
\addplot table[x index = 0, y index=2, col sep=comma] {pgfplots.dat};
\addlegendentry{Case 10}
\addplot table[x index=2, y index=2, col sep=comma] {pgfplots.dat};
\addlegendentry{Case 11}
\addplot table[x index=2, y index=0, col sep=comma] {pgfplots.dat};
\addlegendentry{Case 12}
\end{axis}
\end{tikzpicture}
\caption{PGFPLOT graph}
\end{figure}
\end{document}
/pgfplots/xtick scale label code/.code
. Possibly related : Placement of scale tick labels in pgfplots